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Efficiently Removing Dissolved Organic Pollutants in Landfill Leachate Concentrate Using Dual-Anode Fe2+/Hclo System: The Significance of Insolubilization Based On Oxidative Coupling of Organics

SSRN

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SSRN 2023年

作者： Liang, Sheng Wang, Jinling Shen, Zhizhi Yan, Wei Nengzi, Lichao Feng, Chunhua Yu, Li Hu, Junqing College of Health Science and Environmental Engineering Shenzhen Technology University Shenzhen518118 China Faculty of Chemical Engineering Kunming University of Science and Technology Kunming650500 China State Environmental Protection Key Laboratory of Managing Technology of Drinking Water Source Shenzhen Academy of Environmental Science Shenzhen518001 China Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education School of Environment and Energy South China University of Technology Guangzhou510006 China

The strategy to mineralize dissolved organics for the decontamination of landfill leachate concentrate (LLC) is expensive. Because mineralization requires high stoichiometric ratio of oxidants (e.g., •OH) or electron transfer (i.e., energy) to the pollutants molecular. Whereas, transferring the dissolved organic pollutants into separable insoluble matters is an energy-saving strategy. Herein, we developed a dual-anode Fe2+/HClO system for removing dissolved organic pollutants in LLC through insolubilization based on oxidative coupling. In this system, the majority of dissolved organic pollutants were transferred into insoluble substances, which could be removed easily. 89.8% of the dissolved organic carbon (DOC) in LLC was fast removed in 3 hours with a low specific energy consumption (SEC, 4.0 kWh kg-1 COD and 17.6 kWh kg-1 DOC), and the formation of toxic by-products can be well controlled. Interestingly, the formation of insoluble substances was predominantly attributed to the oxidative coupling of organic small molecules into the macromolecular ones. This was evidenced by the generation of insoluble compounds with the larger molecular mass (evidenced by mass spectrums), and the formation of coupling or polymerization products of the model pollutant (guaiacol). Specifically, the macromolecular matters were derived from the organic radicals (evidenced by EPR tests) coupling with each other. It was reported that Fe2+/HClO reaction produced reactive Fe(IV) under acid condition. According to the investigations in this work, we propose it is possibly because Fe(IV) was generated in the dual-anode Fe2+/HClO system, and Fe(IV) oxidized pollutants to produce the organic radicals. This work offers a novel electrochemical method for efficient removal of organic pollutants in LLC with minimal toxic by-products generated, and revealed the significance of oxidative coupling process in the electrochemical Fe2+/HClO system. © 2023, The Authors. All rights reserved.

关键词： Organic pollutants

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Significant chlorine emissions from biomass burning affect the long-term atmospheric chemistry in Asia

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National Science Review 2024年第9期11卷 213-222页

作者： Di Chang Qinyi Li Zhe Wang Jianing Dai Xiao Fu Jia Guo Lei Zhu Dongchuan Pu Carlos A.Cuevas Rafael P.Fernandez Weigang Wang Maofa Ge Jimmy C.H.Fung Alexis K.H.Lau Claire Granier Guy Brasseur Andrea Pozzer Alfonso Saiz-Lopez Yu Song Tao Wang Atmospheric Chemistry Department Max Planck Institute for Chemistry Department of Atmospheric Chemistry and Climate Institute of Physical Chemistry Blas CabreraCSIC Department of Civil and Environmental Engineering The Hong Kong Polytechnic University Environment Research Institute Shandong University Division of Environment and Sustainability The Hong Kong University of Science and Technology Environmental Modeling Group Max Planck Institute for Meteorology Institute of Environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua University Environmental Central Facility Institute for the Environment The Hong Kong University of Science and Technology Atmospheric Chemistry Modeling& Remote Sensing Research Group Southern University of Science and Technology Institute for Interdisciplinary Science (ICB) National Research Council (CONICET)FCEN-UNCuyo Institute of Chemistry Chinese Academy of Sciences NOAA Chemical Sciences Laboratory/CIRES University of Colorado Laboratoire d’Aerologie CNRSUniversity of Toulouse UPS Atmospheric Chemistry Observation & Modeling Laboratory National Center for Atmospheric Research State Key Joint Laboratory of Environmental Simulation and Pollution Control Department of Environmental Science Peking University

Biomass burning（BB） is a major source of trace gases and particles in the atmosphere,influencing air quality,radiative balance,and *** studies have mainly focused on the BB emissions of carbon and nitrogen species with less attention on *** chlorine chemistry has significant effects on atmospheric chemistry and air ***,quantitative information on chlorine emissions from BB,particularly the long-term trend and associated atmospheric impacts,is limited both on regional and global ***,we report a long-term（20 01-2018） high-resolution BB emission inventory for the major chlorine-containing compounds（HCl,chloride,and CH3Cl） in Asia based on satellite *** estimate an average of 730 Gg yr-1chlorine emitted from BB activity in Asia,with China contributing the largest share at 24.2%(177 Gg yr-1),followed by Myanmar at 18.7% and India at 18.3%.Distinct seasonal patterns and significant spatial and interannual variability are observe d,mainly driven by human-mediated changes in agricultural *** incorporating the newly developed chlorine emission inventory into a global chemistry-climate model（CAM-Chem）,we find that the BB-chlorine emissions lead to elevated levels of HCl and CH3Cl(monthly average up to 2062 and 1421 parts per trillion by volume（pptv）,respectively),subsequently resulting in noticeable changes in oxidants（up to 3.1% in O3and 17% in OH radicals）.The results demonstrate that BB is not only a significant source of air pollutants but also of oxidants,suggesting a larger role of BB emissions in the atmospheric chemistry and oxidation process than previously *** light of the projected increase in BB activity toward the end of the century and the extensive control of anthropogenic emissions worldwide,the contribution of BB emissions may become fundamental to air quality composition in the future.

关键词： biomass burning emission chlorine emission inventory tropospheric halogen chemistry atmospheric oxidants CAM-Chem model

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Recovery of Ni(Ⅱ)from real electroplating wastewater using fixed-bed resin adsorption and subsequent electrodeposition

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Frontiers of environmental Science & Engineering 2019年第6期13卷 115-126页

作者： Tong Li Ke Xiao Bo Yang Guilong Peng Fenglei Liu Liyan Tao Siyuan Chen Haoran Wei Gang Yu Shubo Deng State Key Joint Laboratory of Environment Simulation and Pollution Control Beijing Key Laboratory for Emerging Organic Contaminants ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China Department of Environmental Engineering College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060China Department of Chemical and Environmental Engineering Yale UniversityNew HavenCT 06511USA

Effective recovery of high-value heavy metals from electroplating wastewater is of great significance,but recovering nickel ions from real electroplating wastewater as nickel sheet has not been *** this study,the pilot-scale fixed-bed resin adsorption was conducted to recover Ni(Ⅱ)ions from real nickel plating wastewater,and then the concentrated Ni(Ⅱ)ions in the regenerated solution were reduced to nickel sheet via electrodeposition.A commercial cation-exchange resin was selected and the optimal resin adsorption and regeneration conditions were *** resin exhibited an adsorption capacity of 63 mg/g for Ni(Ⅱ)ions,and the average amount of treated water was 84.6 bed volumes(BV)in the pilot-scale *** the adsorption by two ion-exchange resin columns in series and one chelating resin column,the concentrations of Ni(Ⅱ)in the treated wastewater were below 0.1 mg/*** the regeneration of the spent resin using 3 BVof 4%(w/w)HC1 solution,1.5 BV of concentrated neutral nickel solution(>30 g/L)was obtained and used in the subsequent electrodeposition *** the aeration method,alkali and water required in resin activation process were greatly reduced to 2 BV and 3 BV,*** the optimal electrodeposition conditions,95.6%of Ni(Ⅱ)in desorption eluent could be recovered as the elemental nickel on the cathode,llie total treatment cost for the resin adsorption and regeneration as well as the electrodeposition was calculated.

关键词： Nickel removal Ion exchange Electroplating wastewater Regeneration Electrodeposition

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Spatiotemporal continuous estimates of daily 1-km PM2.5 from 2000 to present under the Tracking Air pollution in China (TAP) framework

arXiv

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arXiv 2022年

作者： Xiao, Qingyang Geng, Guannan Liu, Shigan Liu, Jiajun Meng, Xia Zhang, Qiang State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Ministry of Education Key Laboratory for Earth System Modelling Department of Earth System Science Tsinghua University Beijing100084 China School of Public Health Key Laboratory of Public Health Safety The Ministry of Education Key Laboratory of Health Technology Assessment The Ministry of Health Fudan University Shanghai200032 China

High spatial resolution PM2.5 data covering a long time period are urgently needed to support population exposure assessment and refined air quality management. In this study, we provided complete-coverage PM2.5 predictions with a 1-km spatial resolution from 2000 to the present under the Tracking Air pollution in China (TAP, http://***/) framework. To support high spatial resolution modelling, we collected PM2.5 measurements from both national and local monitoring stations. To correctly reflect the temporal variations in land cover characteristics that affected the local variations in PM2.5, we constructed continuous annual geoinformation datasets, including the road maps and ensemble gridded population maps, in China from 2000 to 2021. We also examined various model structures and predictor combinations to balance the computational cost and model performance. The final model fused 10-km TAP PM2.5 predictions from our previous work, 1-km satellite aerosol optical depth retrievals and land use parameters with a random forest model. Our annual model had an out-of-bag R2 ranging between 0.80 and 0.84, and our hindcast model had a by-year cross-validation R2 of 0.76. This open-access 1-km resolution PM2.5 data product with complete coverage successfully revealed the local-scale spatial variations in PM2.5 and could benefit environmental studies and policy-making. © 2022, CC BY.

关键词： Land use

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碱金属离子诱导亚稳相钌纳米晶合成

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Science Bulletin 2023年第23期68卷 2924-2928,M0004页

作者：张俊涛刘效知陈立刚曹茂丰李晓彤苏东胡志伟徐勇黄小青 State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices Collaborative Innovation Center of Advanced Energy MaterialsSchool of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China State Power Investment Corporation Hydrogen Energy Company Limited Beijing 102209China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Max Planck Institute for Chemical Physics of Solids Dresden 01187Germany

亚稳相金属纳米晶因其优异的物理化学性质备受关注,然而如何可控合成亚稳相结构依然面临诸多挑战.本文报道了碱金属离子诱导亚稳相钌纳米晶(面心立方相)的可控合成策略.研究表明钌纳米晶结构和碱金属离子半径密切相关,因此通过改变碱金... 详细信息

亚稳相金属纳米晶因其优异的物理化学性质备受关注,然而如何可控合成亚稳相结构依然面临诸多挑战.本文报道了碱金属离子诱导亚稳相钌纳米晶(面心立方相)的可控合成策略.研究表明钌纳米晶结构和碱金属离子半径密切相关,因此通过改变碱金属离子实现了面心立方相和六方密堆相比例的连续调控.理论计算结果表明,碱金属的存在导致面心立方相的形成能低于六方密堆相,并且这种能量差随着碱金属离子半径的增大而增大.本工作为拓展亚稳态结构的实际应用奠定了基础.

关键词：亚稳相碱金属离子面心立方纳米晶结构金属纳米晶物理化学性质可控合成钌

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N2o and No Emissions from Beijing's Campus Urban Lawn Soil: Rain-Induced Pulse Fluxes

SSRN

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SSRN 2022年

作者： Avery, Loreena Katherine Ke, Piaopiao Yu, Qian Zhang, Jiawei Huang, Yongmei Yang, Yunfeng Avery, Harold W. Duan, Lei State Key Laboratory of Environmental Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China State Key Laboratory of Pollution Control and Resource Reuse School of The Environment Nanjing University 163 Xian Lin Ave. Jiangsu Nanjing210023 China Faculty of Geographical Science Beijing Normal University Beijing100875 China The Leatherback Trust New Jersey Field Office 1309 Heartwood Dr. Cherry HillNJ08003 United States

The international crisis of climate change and local concerns over urban air quality make the study of the greenhouse gas nitrous oxide (N2O) and the photochemical smog contributor nitric oxide (NO) of great importance. Urban soil is a frequently overlooked source of these gasses. This study investigates the contribution of rainfall events and N deposition on N2O and NO gas emissions from an urban campus lawn in Beijing, China. An in-situ dynamic chamber method was applied to measure pulse N2O and NO fluxes in two soil types, i.e., lawn-covered (> 80% vegetation cover dominated by Poa annua L., "grass") and unmaintained ( © 2022, The Authors. All rights reserved.

关键词： Nitrogen oxides

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Unit-Based Emissions and environmental Impacts of Industrial Condensable Particulate Matter in China in 2020

SSRN

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SSRN 2022年

作者： Wang, Kun Gao, Jiajia Liu, Kaiyun Tong, Yali Dan, Mo Zhang, Xiaoxi Liu, Chunlei Department of Air Pollution Control Institute of urban safety and environmental science Beijing academy of science and technology Beijing100054 China Key Laboratory of Marine Environmental Science and Ecology Ministry of Education Ocean University of China Qingdao266100 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Shanghai Minhang District Qingyue Environmental Protection IT Service Center Shanghai201199 China

The emission of condensable particulate matter (CPM) and its environmental impacts are arousing concern in China with the effective control of filter particulate matter (FPM). This study established an up-to-date and unit-based CPM emission inventory for industrial sectors and systematically evaluated the effects of CPM on primary and secondary PM2.5 in China. In 2020, the national CPM emissions total for industrial sectors was estimated to be 0.98 Tg with uncertainty from −49% to 66%, including 0.62 Tg of organic CPM (CPMorg) and 0.36 Tg of inorganic CPM (CPMin). Totals of 62%, 23% and 8% CPM were emitted from coal-fired power plants, coal-fired industrial boilers and sinter plants, respectively. By filling CPM emissions in PM2.5 simulation, the normalized mean bias (NMB) of model to observation was improved from −27% to −14% in East, North and Central China. The 4 μg/m3 PM2.5 concentration was attributed to CPM emissions in this region, accounting for 10% of observations. On "polluted" days (PM2.5 >75 μg/m3), industrial CPM emissions can contribute 7 μg/m3 PM2.5 in North China, wherein more than 75% of the secondary PM2.5 can be caused by CPMorg emissions. Therefore, China should focus on controlling CPM from coal combustion to ensure continuous air quality improvement. © 2022, The Authors. All rights reserved.

关键词： Coal

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Efficient Hydrogenation of P-Chlorophenol and Cr(Vi) Driven by Hydrogen Rich Balls Over Pd/C Catalysts

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SSRN 2022年

作者： Niu, Junfeng Zhang, Yuanzheng Xu, Lei Pei, Yuansheng Niu, Junfeng Wang, Weilai Ministry of Education Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control School of Environment Henan Normal University Henan Xinxiang453007 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing100875 China College of Environmental Science and Engineering North China Electric Power University Beijing102206 China Dongguan University of Technology China

Catalytic hydrogenation can selectively destabilize and detoxify specific contaminants in water. Guided by the adsorption-activation hydrogenation mechanism, carrier selection and active center construction have become the main content of hydrogenation catalyst research. However, this relies heavily by the development of new materials and technologies. Herein, from the perspective of hydrogen source, hydrogen rich balls (HRBs) were used to supply H2 for hydrogenating p-chlorophenol and Cr(VI) over Pd/C catalyst. The results showed that HRBs can realize the sustained release of H2 (14±2 µL/min·g) by replacing the hydrogen in water, and generate the refined (micro/nano-sized) H2 bubble, which effectively improves the adsorption and activation effectively of H2 molecules on Pd/C catalyst, and the hydrogen atoms utilization efficiency during p-chlorophenol hydrodechlorination is as high as 3.5%. Continuous flow experiments showed that rapid removal of p-chlorophenol with different concentrations could be achieved by adjusting the flow rate. Moreover, the high-toxic Cr(VI) was successfully reduced to the low-toxic Cr(III) by molecular hydrogen and active hydrogen in an appropriate pH range. This research is of far-reaching significance for realizing the detoxification of environmental pollutants and promoting the development of hydrogen economy. © 2022, The Authors. All rights reserved.

关键词： Atoms

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Effect of Nanoparticles and Nanosheets on Improving the Oil/Water Interface Performance of Surfactants in Enhancing Oil Recovery: A Comparative Study by Molecular simulation

SSRN

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SSRN 2022年

作者： Fu, Lipei Gu, Feng Liao, Kaili Ma, Qianli Shao, Minglu Cheng, Yuan Huang, Weiqiu Li, Bing Si, Wenzhe School of Petroleum Engineering Changzhou University Changzhou213164 China State Key Joint Laboratory of Environment Simulation and Pollution Control National Engineering Laboratory for Multi Flue Gas Pollution Control Technology and Equipment School of Environment Tsinghua University Beijing100084 China The Key Laboratory of Well Stability and Fluid & Rock Mechanics in Oil and Gas Reservoir of Shaanxi Province Xi'an Shiyou University Xi'an710065 China Jiangsu Zhongchuang Qingyuan Technology Co. Ltd. Yancheng224000 China

In recent years, nanoparticles have become the most potential enhanced oil recovery technology due to their unique small size effect and specific surface area effect. With the research and application of graphene and its derived materials, nanosheets are the research hotspot of nanomaterials for enhanced surfactant flooding, but there is no report on the molecular simulation comparison of nanoparticles and nanosheets to enhance surfactant performance. Therefore, in this paper, we first constructed nano-SiO2 particles grafted with hydroxyl and pentyl alkane activator, graphene nanosheets grafted with carboxylic acid chain and pentyl alkane activator. On this basis, the interfacial tension, interfacial density, interfacial generation energy and radial distribution function were analyzed by molecular dynamics simulation. The results showed that both nanoparticles and nanosheets could produce synergistic effect with amphoteric surfactant dodecyl dimethylaminoethyllactone (BS-12), and the synergistic effect of nanosheets with BS-12 was stronger after carboxylic acid chain and pentyl alkane activator were grafted on the surface of nanosheets. The interfacial tension of n-dodecane/water can be reduced to 13.58 mN/m by the combination of modified nanoparticles and BS-12, while the interfacial tension of n-dodecane/water can be reduced to 4.15 mN/m by the combination of modified nanosheets and BS-12, which means that the ability of reducing oil-water interfacial tension is significantly improved. Second, the calculation of n-dodecane/water interface thickness and interface formation energy showed that compared with the modified nanoparticles and BS-12 compound system, the interface thickness of the modified nanoparticles and BS-12 compound system increased by 9.24%, and the interface formation energy increased by 17.85%. In addition, the results of radial distribution function analysis also showed that the modified nanosheets had strong hydration with water molecules after c

关键词： Distribution functions

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Incorporating Catalytic Ceramic Membrane into the Integrated Process of in Situ Ozonation, Membrane Filtration and Biological Degradation: Enhanced Performance and Underlying Mechanisms

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SSRN 2022年

作者： Chen, Rong Zhang, Kai Wang, Hao Wang, Xiao-Mao Zhang, Xi-Hui Huang, Xia State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China Institute for Environmental Engineering & Nano-Technology Tsinghua Shenzhen International Graduate School Tsinghua University Guangdong 518055 China Beijing Drainage Group Co. Ltd Beijing100124 China Bgrimm Technology Group Beijing100160 China

The integrated process comprising of in situ ozonation, ceramic membrane filtration and biologically active carbon filtration has a bright application prospect in wastewater reclamation. Additionally, ceramic membranes of stronger catalytic activity are highly desirable so as to further increase the process cost-efficiency. In this study, a Mn-based catalytic membrane was tested by conducting pilot-scale experiments of the integrated process to measure its performance in enhancing pollutant removal and in alleviating membrane fouling. Lab-scale experiments were also conducted in order to investigate the underlying mechanisms in which the conventional Al2O3 membrane was used for comparison. Results showed that the integrated process with an incorporated catalytic membrane performed very well in that at a water flux as high as 80 L/m2/h and an ozone dosage of 5 mg/L, the treated water satisfied the guideline values for indirect potable reuse and membrane fouling was minimal. Reducing the ozone dosage to 4 mg/L can still achieve significant membrane fouling control effects, and maintain good effluent quality. Catalytic ozonation could lead to the generation of hydroxyl radicals, and the catalytic ozonation effect was much stronger when the catalytic membrane was used. Catalytic ozonation took place in both the membrane tank and membrane pores, with comparable contributions to the pollutant removal and membrane fouling control. Redundancy analysis (RDA) of membrane fouling characteristics showed that residual ozone concentration in membrane tank was an essential parameter and catalytic ozonation could be more effective in abating irreversible fouling than reversible fouling. RDA also confirmed that a lower ozone dosage would be sufficient for membrane fouling control when the catalytic membrane was used. This study evidently suggested the advantage of using catalytic ceramic membrane in the integrated process for efficient while economic treatment and reclamation of was

关键词： Manganese oxide

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